Simple protocol for sugar keyboard notification observing

KeyboardNotificationObserver.swift

protocol KeyboardNotificationObserver {
    
    typealias Selectors = (show: Selector, hide: Selector)
    
    func addKeyboardWillChangeObservers(with selectors: Selectors)
    func removeKeyboardWillChangeObservers()
    func addKeyboardDidChangeObservers(with selectors: Selectors)
    func removeKeyboardDidChangeObservers()
}

extension KeyboardNotificationObserver {
    
    func addKeyboardWillChangeObservers(with selectors: Selectors) {
        zip([selectors.show, selectors.hide], keyboardWillChangeNames).forEach(addObserver)
    }
    
    func removeKeyboardWillChangeObservers() {
        removeObserver(for: keyboardWillChangeNames)
    }
    
    func addKeyboardDidChangeObservers(with selectors: Selectors) {
        zip([selectors.show, selectors.hide], keyboardDidChangeNames).forEach(addObserver)
    }
    
    func removeKeyboardDidChangeObservers() {
        removeObserver(for: keyboardDidChangeNames)
    }
    
    // MARK: - Private
    
    private var keyboardWillChangeNames: [NSNotification.Name] {
        return [.UIKeyboardWillShow, .UIKeyboardWillHide]
    }
    
    private var keyboardDidChangeNames: [NSNotification.Name] {
        return [.UIKeyboardDidShow, .UIKeyboardDidHide]
    }
    
    private func addObserver(with selector: Selector, name: NSNotification.Name) {
        NotificationCenter.default.addObserver(self, selector: selector, name: name, object: nil)
    }
    
    private func removeObserver(for names: [NSNotification.Name]) {
        names.forEach { NotificationCenter.default.removeObserver(self, name: $0, object: nil) }
    }
}

//Using:
//final class ViewController: UIViewController, KeyboardNotificationObserver {
//
//    deinit {
//        removeKeyboardWillChangeObservers()
//    }
//
//    override func viewDidLoad() {
//        super.viewDidLoad()
//        let selectors = (#selector(keyboardWillShow(notification:)), #selector(keyboardWillHide(notification:)))
//        addKeyboardWillChangeObservers(with: selectors)
//    }
//}